Abstract: The dispersion simulations are carried out over a coastal region where Zhangzhou nuclear power station will be located. The diagnostic wind model, trajectory analysis and random walk model are used. The dispersions in this area are determined both by synoptic systems and land-sea breeze circulation. Spatial variation of wind field is not obvious, which leads to the straight dispersion plume. Temporal variation of wind field, particularly the wind direction transition caused by transient of land and sea breezes, plays an important role in atmospheric diffusion. Results from random walk simulations agree well with the in situ tracer experiment data, though quite large scatter still exists in some cases due to the effects by complex terrain and coastal meteorological condition.

Key words: atmospheric diffusion, numerical simulation, tracer experiment, nuclear power station

摘要： 用福建漳州地区的实测气象资料, 结合风场诊断、轨迹分析和随机游走模拟方法, 分析漳州核电厂所在地小尺度( 40 km ×40 km) 范围内的大气扩散特性, 并与现场扩散示踪实验数据比较。结果表明, 该地区的扩散输送总体受天气系统和海陆风环流二因子影响。研究范围内的风场在水平方向的空间变化不大, 扩散烟流基本平直。海陆风环流因子所致的风场时间变化和风向摆动对当地扩散有重要意义。随机游走模拟方法较好地反映出当地大气扩散的定量特征, 但复杂地形与海岸气象条件的联合作用, 仍使模拟结果与示踪实验结果的统计比较显得离散。

关键词: 大气扩散, 数值模拟, 示踪实验, 核电厂